JavaScript is everywhere! It’s in browsers, but also increasingly on servers. In this talk, Kito Mann describes why JavaScript is the only language that does (and will) run in every browser — and thus why it’s the language that we increasingly need to think about. The thing is, thinking about JavaScript doesn’t mean writing in JavaScript; the talk describes several languages built on top of JavaScript, and compares their advantages and disadvantages, as well as why people would use them rather than ES6 (i.e., the new version of JavaScript).